The only way from Grebenstein to City of London is by flight. You should expect to be able to find tickets starting around $326, if you search flights from KSF to LHR. The best time to book shorter flights is 2-3 weeks before your trip.
On your trip from Grebenstein to City of London, it is best to book as soon as possible. It won't necessarily help reduce your price by a large amount, but will ensure that you have a spot on the bus or train.
|Cheapest Way||Flight — $326|
|Fastest Way||Flight — 5h 56min|
|Eco-Friendly Way||Flight — 533 lb CO2|
|Available Modes||1 modes — flight|